This Number Sequence is Driving me MAD

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1,2,4,__,10,___,16,18

I saw this problem in a kid's math textbook, and I still can't figure out what the answer is supposed to be. I can't see the logic. Pls. lend me your thoughts on this.
 
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Primes minus one.

1, 2, 4, 6, 10, 12, 16 ,18, ...
 
thanks a lot gazzo! I owe you one.
 

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